tssh

#!/bin/bash
# This script emulates cssh (see http://sourceforge.net/projects/clusterssh/)
# using tmux panes.  It must be run from within a tmux session.

# For each host listed on the command line, it splits a pane and connects via
# ssh.  The tmux window is left in 'synchronize-panes' mode, which replicates
# input into any pane to all others.  I've bound toggling this mode to a key
# (`e') in my tmux.conf:
#     bind e set-window-option synchronize-panes

if [ "$#" -lt 1 ]; then
	echo "Usage: $(basename $0) hostname [hostname ...]"
	exit 1
fi
if [ -z "$TMUX" ]; then
	echo "Error: $(basename $0) must be run from within a tmux session."
	exit 1
fi

FIRST_HOST="$1"
shift

# Split panes and ssh to remaining hosts
for HOST in "$@"; do
	tmux splitw "ssh $HOST"
	# change layout each time to keep split pane from getting to small
	tmux select-layout tiled
done

tmux set-window-option synchronize-panes on

# And shh to first host in this pane
exec ssh "$FIRST_HOST"